Substrate or Solvent-Controlled Pd<sup>II</sup>
-Catalyzed Regioselective Arylation of Quinolin-4(1<i>H</i>
)-ones Using Diaryliodonium Salts: Facile Access to Benzoxocine and Aaptamine Analogues
作者:Manish K. Mehra、Shivani Sharma、Krishnan Rangan、Dalip Kumar
DOI:10.1002/ejoc.202000013
日期:2020.5.3
Substrate or solvent controlled regioselective C3, C5, and C8 arylation of quinolin‐4(1H)‐ones with diaryliodoniumsalts have been successfully achieved in high yields (up to 96 %). These protocols are applicable to a wide range of quinolone related heterocycles and provide potential access to naturally occurring benzoxocine and aaptamineanalogues
Synthesis of Bridged Benzazocines and Benzoxocines by a Titanium-Catalyzed Double-Reductive Umpolung Strategy
作者:Plamen Bichovski、Thomas M. Haas、Daniel Kratzert、Jan Streuff
DOI:10.1002/chem.201405852
日期:2015.2.2
A sequence of two titanium(III)‐catalyzed reductive umpolung reactions is reported that allows the rapid construction of benzazo‐ and benzoxozine building blocks. The first step is a reductive cross‐coupling of quinolones or chromones with Michael acceptors. This reaction proceeds with complete syn‐selectivity for the quinolone functionalization while the anti‐diastereomers are obtained as the major
Efficient construction of 3-arylquinolin-4(1 H )-ones via in situ Meinwald rearrangement/intramolecular reductive cyclization of 2′-nitrochalcone epoxides
An efficient method for construction of 3-arylquinolin-4(1H)-ones via in situ Meinwald rearrangement/intramolecular reductive cyclization of 2′-nitrochalcone epoxides has been developed. The practical approach is of excellent functional groups compatibility with as high as 98% yield under mild reaction conditions. Trapping and NMR analysis about the key intermediates of the transformation provided
Palladium-Catalyzed Dehydrogenation/Oxidative Cross-Coupling Sequence of β-Heteroatom-Substituted Ketones
作者:Youngtaek Moon、Daeil Kwon、Sungwoo Hong
DOI:10.1002/anie.201206610
日期:2012.11.5
Concise and selective: The title one‐pot sequence allows formation of the enone functionality and subsequent cross‐coupling. The process provides access to highly functionalized cyclic enolones and enaminones from readily accessible β‐heteroatom‐substituted cyclic ketones.
Palladium-Catalyzed Decarboxylative Coupling of Quinolinone-3-Carboxylic Acids and Related Heterocyclic Carboxylic Acids with (Hetero)aryl Halides
作者:Samir Messaoudi、Jean-Daniel Brion、Mouad Alami
DOI:10.1021/ol300235k
日期:2012.3.16
An efficient and practical decarboxylative cross-coupling reaction of quinolin-4(1H)-one 3-carboxylic acids with (hetero)arylhalides has been established. Under a bimetallic system of PdBr2 and silver carbonate, the protocol proved to be general, and a variety of 3-(hetero)aryl 4-quinolinones and related heterocycles, such as 3-aryl-1,8-naphthyridin-4(1H)-ones, 3-arylcoumarins, 3-arylquinolin-2(1H)-ones